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为探讨育苗期间5个不同的环境因子对西瓜幼苗素质的影响,研究不同光照、营养钵及磷酸二铵用量对西瓜幼苗的形态指标及生理指标的影响。试验结果表明,在2/5光照、8cm营养钵育苗、磷酸二铵用量0.5kg/m^3的条件下,西瓜幼苗的形态指标及生理指标最好,即西瓜幼苗脯氨酸含量最低、根系活力最大、壮苗指数最大。因此,不但可以培育西瓜壮苗,而且经济效益也较高。 相似文献
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不同微生物菌剂对西瓜生长发育和产量的影响 总被引:1,自引:0,他引:1
《现代园艺》2017,(1)
通过测定分析西瓜的相关生理生化指标,研究不同微生物菌剂对西瓜生长发育和产量的影响,并筛选出能够提质增效的微生物菌剂。 相似文献
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《中国瓜菜》2019,(6):32-37
合理的间作可以有效缓解西瓜连作障碍问题,有利于西瓜生产的可持续发展。为了探讨西瓜与小麦间作对西瓜生长的影响,采用盆栽基质模拟连作土壤,设置小麦和西瓜根系的不同分隔方式(西瓜和小麦根系间作不分隔、用尼龙网分隔、用塑料膜分隔,单种西瓜为对照,),研究不同分隔方式下间作小麦对西瓜根际土壤生物学性状的影响,西瓜定植前接入西瓜专化型尖孢镰刀菌。结果表明,西瓜与小麦根系不分隔处理和用尼龙网分隔处理下西瓜植株的生理参数(叶绿素含量、根系活力、叶片SOD和CAT活性)、土壤酶活性(蔗糖酶和磷酸酶)、土壤细菌的数量,均优于对照和用塑料膜分隔处理;另一方面,西瓜与小麦根系不分隔处理和用尼龙网分隔处理下西瓜植株POD活性、MDA含量、土壤真菌和尖孢镰刀菌的数量均低于对照和用塑料膜分隔处理;但西瓜和小麦根系不同分隔处理和对照处理西瓜植株的生物量(株高和干质量)和土壤放线菌的数量无显著差异。综上,小麦与西瓜间作能增强西瓜植株的生理抗性,提高西瓜根际土壤酶活性,改善根际微生物种群结构。 相似文献
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弱光条件下不同光周期对西瓜幼苗生长发育的影响 总被引:1,自引:0,他引:1
《上海蔬菜》2021,(4)
光周期是影响植物营养生长及生理变化的重要环境因子。为探明不同光周期对西瓜幼苗生长发育的影响,作者研究了4种不同光周期对弱光条件下西瓜幼苗生长发育的影响。试验结果表明,弱光条件下16 h的光周期处理,西瓜幼苗矮化健壮、叶片宽大、根系发达,且成苗时间比10 h光周期处理减少5 d,缩短了西瓜的育苗周期,可节约育苗成本。 相似文献
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微生物制剂对连作西瓜生长和果实品质的影响 总被引:3,自引:0,他引:3
用4种不同微生物制剂对设施条件下连作西瓜土壤进行处理,通过测定连作西瓜植株的长势、生理指标以及西瓜果实产量和品质,来考察其对连作障碍的影响.结果表明:4种微生物制剂均能够促进连作西瓜生长,提高产量,改善生理指标和果实品质,有效的抑制连作障碍的发生.其中,护根宝处理对连作西瓜株高、茎粗、根系活力及产量的影响最为显著(P<0.05),较对照分别提高132.1%、22.3%、36.1%和56.9%;连茬王处理对连作西瓜叶片色素含量的影响最为明显,此处理西瓜叶片中叶绿素a、叶绿素b和类胡萝卜素含量分别提高了19.6%,22.9%和38.2%;生态调理剂和植保康对连作西瓜果实品质的改善作用最显著(P<0.05),生态调理剂处理与对照相比,游离氨基酸、可溶性固形物分别较对照提高62%和38.7%,植保康处理与对照相比,游离氨基酸、可溶性固形物分别比对照提高了56.9%和32.9%. 相似文献
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以甜樱桃为母本、中国樱桃为父本进行了种间远缘杂交,研究了静电场对远缘亲和性及杂种胚萌发生长的影响,并用流式细胞仪对杂种的真实性进行了鉴定。结果表明,1)用强度为333~434 kV.m-1的静电场处理花粉对提高樱桃远缘杂交坐果率、克服杂交不亲和性具有明显作用;2)用场强为333~474 kV.m-1的静电场处理后的花粉进行樱桃远缘杂交,在胚抢救过程中,其杂种胚的萌发生长率、生长状况及多丛芽诱导与增殖能力等均明显高于对照,表明适宜场强的静电场处理确实对杂种胚萌发生长以及多丛芽的诱导与增殖具有积极作用;3)研究发现,MS+6-BA 0.6 mg.L-1有利于减少胚芽梢继代增殖过程中的玻璃化现象,是樱桃远缘杂种胚多丛芽诱导与增殖的适宜培养基;4)通过流式细胞仪进行的倍性鉴定结果表明,所测杂种1号和杂种2号均是倍性为三倍体的真杂种。研究进一步优化了樱桃远缘杂交的胚抢救体系。 相似文献
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介绍了一种适合防止粉虱成虫入侵温室的直流电网吸收器。该吸收器利用高压直流电源、铜导管等制作而成,利用其产生高压静电吸收并杀死害虫,在田间防治粉虱效果较好。 相似文献
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Xiong Xiong Lingfeng Duan Lingbo Liu Haifu Tu Peng Yang Dan Wu Guoxing Chen Lizhong Xiong Wanneng Yang Qian Liu 《Plant methods》2017,13(1):104
Background
Rice panicle phenotyping is important in rice breeding, and rice panicle segmentation is the first and key step for image-based panicle phenotyping. Because of the challenge of illumination differentials, panicle shape deformations, rice accession variations, different reproductive stages and the field’s complex background, rice panicle segmentation in the field is a very large challenge.Results
In this paper, we propose a rice panicle segmentation algorithm called Panicle-SEG, which is based on simple linear iterative clustering superpixel regions generation, convolutional neural network classification and entropy rate superpixel optimization. To build the Panicle-SEG-CNN model and test the segmentation effects, 684 training images and 48 testing images were randomly selected, respectively. Six indicators, including Qseg, Sr, SSIM, Precision, Recall and F-measure, are employed to evaluate the segmentation effects, and the average segmentation results for the 48 testing samples are 0.626, 0.730, 0.891, 0.821, 0.730, and 76.73%, respectively. Compared with other segmentation approaches, including HSeg, i2 hysteresis thresholding and jointSeg, the proposed Panicle-SEG algorithm has better performance on segmentation accuracy. Meanwhile, the executing speed is also improved when combined with multithreading and CUDA parallel acceleration. Moreover, Panicle-SEG was demonstrated to be a robust segmentation algorithm, which can be expanded for different rice accessions, different field environments, different camera angles, different reproductive stages, and indoor rice images. The testing dataset and segmentation software are available online.Conclusions
In conclusion, the results demonstrate that Panicle-SEG is a robust method for panicle segmentation, and it creates a new opportunity for nondestructive yield estimation.15.
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Mauricio Almeida-Gomes Jayme Augusto Prevedello Daniela Lopes Scarpa Jean Paul Metzger 《Landscape Ecology》2016,31(5):929-937
Context
Landscape ecology has traditionally been taught through theoretical classes or computer labs. On the other hand, field labs have been generally less used as a way of teaching landscape ecology concepts.Objectives
We show that field labs with an inquiry-based approach, where students are involved in the investigation, are feasible for training students in landscape ecology. We evaluated how common field labs are in landscape ecology courses, and also their contribution for student learning.Methods
We evaluated whether field labs are used in landscape ecology courses by scanning available syllabi. We also used outcomes from a course offered in Brazil to show how field labs can be integrated into landscape ecology courses.Results
Only 18.2 % of the 44 syllabi we found had field labs. The case study developed in Brazil showed that field labs allowed students to develop important skills, including the ability to design field studies, choose appropriate scales of analysis, detect ecological patterns, and judge multiple hypotheses.Conclusions
Field labs are still uncommon in landscape ecology courses, but they can be a useful tool to teach landscape ecology concepts and to help students developing the necessary skills to do research. We offer recommendations regarding how to incorporate field labs in landscape ecology courses.18.
为揭示根域调控技术促进根系生长的原理,进一步完善根域调控技术体系,以12年生大田盛果期‘红富士/平邑甜茶’苹果树(Malus ´ domestica Borkh.‘Red Fuji’/M. hupehensis Rehd.)为试材,分析了“砖土缓冲系统”和“混合土系统”两种根域调控处理下根域土壤的物理性状、土壤肥力、土壤相关酶活性、根系活力、根系构型等的变化差异情况。结果表明:与正常的施肥管理相比,根域调控处理能够显著降低0 ~ 40 cm 根系集中分布层土壤的容重,增加土壤孔隙度,提高土壤田间持水量及干旱时期土壤含水量;提高土壤有机质、碱解氮和速效钾的含量,且在处理后3年期间一直保持较高的土壤肥力;根域调控还可提高果树根系活力,增加根系密度,尤其以0 ~ 1 mm 径级的生长根增加最为明显。与混合土系统相比,砖土缓冲系统通过砖的吸水保湿性,改善了周围混合土的环境,对土壤和根系的改良效果进一步提高。 相似文献
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Tao Liu Tianle Yang Chunyan Li Rui Li Wei Wu Xiaochun Zhong Chengming Sun Wenshan Guo 《Plant methods》2018,14(1):101